Conspiracy theorist Alex Jones, who earlier this year led the push to have CNN host Piers Morgan deported, is now calling on singer Taylor Swift to stop endorsing Diet Coke.

Jones’ criticism, released on Friday, hinges on the soda containing the sweetener Aspartame, which some studies have linked to different kinds of cancer. The substance, he said, is the result of a 1960s Pentagon study that sought to produce genetically-engineered e-coli bacteria, meaning that soda drinkers were drinking “the feces” of the results.